JP3359158B2 - Surface pattern reader - Google Patents
Surface pattern readerInfo
- Publication number
- JP3359158B2 JP3359158B2 JP22016894A JP22016894A JP3359158B2 JP 3359158 B2 JP3359158 B2 JP 3359158B2 JP 22016894 A JP22016894 A JP 22016894A JP 22016894 A JP22016894 A JP 22016894A JP 3359158 B2 JP3359158 B2 JP 3359158B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- surface pattern
- light emitting
- read
- receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
- G07D5/005—Testing the surface pattern, e.g. relief
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Coins (AREA)
- Image Input (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、硬貨、メダル、カード
などの読取対象物の表面パターンを読み取る表面パター
ン読取装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface pattern reading device for reading a surface pattern of an object to be read such as coins, medals, cards and the like.
【０００２】[0002]
【従来の技術】所定の物品の真偽を判別する必要性はま
すます高まっているが、この傾向は硬貨やメダルを扱う
バンクマシンや自動販売機等の分野で特に顕著である。
従来の硬貨読取装置は、硬貨の大きさ、厚みさらには材
質を基準にして当該硬貨の真偽を判別しているが、この
判別方法では、近年の国際化に伴う社会問題に充分に対
処し得ない様相を呈している。即ち、近年の国際化で多
数の外国人が我国に入国しているが、この入国に伴い、
我国の硬貨に酷似した多数の外国硬貨が流入、且つ、氾
濫し、その結果、判別し難い偽造硬貨が行使されて経済
活動が大きく阻害されることが少なくない。例えば、日
本国政府が発行している５００円硬貨は、世界で最も多
いサイズであり、硬貨の大きさや厚み等の外形的寸法か
らでは、韓国やロシヤ等の外国の硬貨と区別することは
ほとんどできない。そこで、近年の硬貨読取装置は、照
明装置を用いて、硬貨の刻印、詳言すれば、硬貨の露出
面における図形、数字、又は、文字等を基準にして当該
硬貨の真偽を判別する工夫が施されている。2. Description of the Related Art The necessity of discriminating the authenticity of a given article is increasing, but this tendency is particularly remarkable in the field of bank machines and vending machines handling coins and medals.
Conventional coin readers discriminate the authenticity of coins based on the size, thickness, and material of the coins, but this discrimination method sufficiently addresses social problems associated with recent internationalization. It has an unobtainable appearance. In other words, many foreigners have entered Japan due to recent internationalization, but with this entry,
Many foreign coins very similar to Japanese coins flow in and flood, and as a result, hard-to-identify counterfeit coins are exercised and economic activities are often hindered. For example, the 500-yen coin issued by the Japanese government is the largest size in the world, and it is almost impossible to distinguish it from foreign coins such as Korea and Russia from the external dimensions such as the size and thickness of the coin. Can not. Therefore, recent coin readers use a lighting device to engrave a coin, in other words, a device for discriminating the authenticity of the coin on the basis of figures, numbers, or characters on the exposed surface of the coin. Is given.
【０００３】従来の硬貨読取装置、即ち、表面パターン
読取装置には、特開平５−８９２７６号公報に開示され
たものがある。この表面パターン読取装置は、搬送され
る読取対象物の表面パターンを上部に配設した撮像素子
で撮像し、撮像された画像データより読取対象物の真偽
の判別を行うものである。A conventional coin reader, that is, a surface pattern reader, is disclosed in Japanese Patent Application Laid-Open No. 5-89276. In this surface pattern reading device, an image of a surface pattern of an object to be conveyed to be conveyed is taken by an image pickup device arranged at an upper portion, and the authenticity of the object to be read is determined from image data of the taken image.
【０００４】[0004]
【発明が解決しようとする課題】ところで、従来の表面
パターン読取装置は、撮像素子の撮像エリアに読取対象
物が到来したことを検出するための検出器を、撮像エリ
ア直前の搬送路上に備えているものが多い。検出器は、
発光素子と受光素子を組み合わせた構成のものが一般的
で、搬送路の一方の面側に発光素子が、他方の面側に受
光素子がそれぞれ配設され、発光素子からの照射光が撮
像エリア直前の搬送路を貫いて受光素子に入射する。し
たがって、撮像エリア直前の搬送路上に読取対象物が搬
送された場合には発光素子からの照射光が遮られて受光
素子での受光量が大幅に減少し、この受光量変化から撮
像エリアへの読取対象物の到来を検出することができ
る。Incidentally, the conventional surface pattern reading apparatus is provided with a detector for detecting that the object to be read has arrived at the image pickup area of the image pickup element, on a transport path immediately before the image pickup area. There are many things. The detector is
In general, a light-emitting element and a light-receiving element are combined, and a light-emitting element is provided on one side of the transport path, and a light-receiving element is provided on the other side. The light passes through the transport path immediately before and enters the light receiving element. Therefore, when the object to be read is conveyed on the conveyance path immediately before the imaging area, the irradiation light from the light emitting element is blocked, and the amount of light received by the light receiving element is greatly reduced. The arrival of the object to be read can be detected.
【０００５】しかしながら、この検出器を備えた従来の
表面パターン読取装置は、発光素子からの照射光が読取
対象物の表面で反射して、反射光の光点が画像中に映り
込むといった問題があった。[0005] However, the conventional surface pattern reading device provided with this detector has a problem that the irradiation light from the light emitting element is reflected on the surface of the object to be read, and the light spot of the reflected light is reflected in the image. there were.
【０００６】本発明は、このような問題を解決し、光点
の映り込みのほとんど無い表面パターン読取装置を提供
することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to provide a surface pattern reading apparatus having almost no reflection of a light spot.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に、本発明の表面パターン読取装置は、所定の基準面に
沿って搬送される読取対象物の表面パターンを読み取る
装置であって、基準面の所定の撮像領域を貫いて光を照
射する発光部と、撮像領域を挟んで発光部に対向して配
置され、発光部からの照射光を受光する受光部とを有し
てなる検出手段と、受光部での受光量の変化を検出し、
その受光量が減少した状態から増加した際に、撮像領域
に読取対象物が到達したことを示す制御信号を送出する
制御回路と、制御回路から送出された制御信号に従って
読取対象物の表面に光を照射する発光手段と、光の入射
を受けて内部電極に電荷を蓄積させる第１の処理と内部
電極に蓄積された電荷を出力する第２の処理を実行する
機能を有し、発光手段からの光の照射タイミングと同期
して、それまで継続していた蓄積電荷の水平１ライン毎
のオーバーフロードレインへの排出動作を中断させると
共に第１の処理を行い、発光手段からの照射光が読取対
象物の表面で反射した光の入射を受けて内部電極に電荷
を蓄積させ、さらに、第１の処理の終了タイミングと同
期して第２の処理を行い、内部電極に蓄積された電荷を
出力する撮像手段とを備える。In order to solve the above problems SUMMARY OF THE INVENTION The surface pattern reading apparatus of the present invention is an apparatus for reading a surface pattern of the object to be read being conveyed along a predetermined reference plane, the reference Illuminate through a given imaging area on the surface
And the light-emitting unit that emits light,
And a light receiving unit for receiving the irradiation light from the light emitting unit.
Detection means, and detects a change in the amount of light received by the light receiving section,
When the amount of received light increases from a reduced state,
A control signal indicating that the object to be read has arrived at
A control circuit, a light emitting means for irradiating light to the surface of the object to be read in accordance with a control signal sent from the control circuit, a first process for receiving light and accumulating electric charges in an internal electrode, It has a function of executing a second process of outputting the charge accumulated in the electrode, and synchronizes with the irradiation timing of the light from the light-emitting means, for each horizontal line of accumulated charge which has been continued up to that time.
Interrupting the draining operation of the overflow drain
The first processing is performed together , and the irradiation light from the light emitting unit receives the light reflected on the surface of the object to be read, accumulates electric charges in the internal electrodes, and further, in synchronization with the end timing of the first processing. An imaging unit that performs the second processing and outputs the electric charge accumulated in the internal electrode.
【０００８】[0008]
【作用】本発明の表面パターン読取装置によれば、基準
面に沿って搬送される読取対象物が検出手段の発光部の
光路上に到達した際には、発光部からの照射光が遮断さ
れるため検出手段の受光部での受光量が減少し、更に、
読取対象物が搬送されて発光部の光路上を通過し、撮像
領域に読取対象物が到達した際には、発光部からの照射
光が再び受光部に照射されるため受光部での受光量が増
加する。このように受光部での受光量が減少した状態か
ら増加した際には、撮像領域に読取対象物が到達したこ
とを示す制御信号が制御回路から送出され、これに従っ
て、発光手段からの光が読取対象物の表面を照射する。
撮像手段では、この照射タイミングに同期して、それま
で継続していた蓄積電荷の水平１ライン（１Ｈ）毎のオ
ーバーフロードレインへの排出動作を中断させると共
に、内部電極に電荷を蓄積させる第１の処理を行う。こ
の第１の処理によって、読取対象物の表面で反射した光
の像が電荷として内部電極に蓄積される。第１の処理が
終了すると、終了タイミングと同期して、第２の処理が
実行される。この第２の処理によって、内部電極に蓄積
された読取対象物の表面パターン像の電荷が出力され
る。According to the surface pattern reading apparatus of the present invention, the object to be read conveyed along the reference plane is formed by the light emitting portion of the detecting means.
When the light reaches the optical path, the light emitted from the light emitting unit is blocked.
As a result, the amount of light received by the light receiving section of the detecting means is reduced, and
The object to be read is conveyed and passes over the light path of the light emitting unit, and the image is taken.
When the object to be read reaches the area,
Light is re-irradiated to the light-receiving part, increasing the amount of light received by the light-receiving part.
Add. Is the state where the amount of light received by the light receiving section has decreased in this way?
When the reading target reaches the imaging area
Control signal is sent from the control circuit, and
Thus, light from the light emitting means irradiates the surface of the reading object.
In synchronization with the irradiation timing, the imaging means interrupts the discharging operation of the accumulated charges to the overflow drain for each horizontal line (1H) and accumulates the charges in the internal electrodes. Perform processing. By the first process, the image of the light reflected on the surface of the object to be read is accumulated as charges on the internal electrodes. When the first processing ends, the second processing is executed in synchronization with the end timing. By this second processing, the electric charges of the surface pattern image of the object to be read stored in the internal electrodes are output.
【０００９】このように、撮像手段の内部電極への電荷
の蓄積処理が終了すると同時に、電荷の出力が行われる
ので、内部電極で電荷を保持する期間は非常に短い。こ
のため、外部から侵入した光の影響で不要な電荷が蓄積
されることはほとんどない。つまり、例えば、検出手段
の発光部からの照射光が内部電極に入射しても、内部電
極に電荷を保持している期間が非常に短いため、不要な
電荷が蓄積される危険性が少ない。As described above, since the charge is output at the same time as the completion of the process of accumulating the charges in the internal electrodes of the imaging means, the period for holding the charges in the internal electrodes is very short. For this reason, unnecessary electric charges hardly accumulate under the influence of light that has entered from the outside. That is, for example, the detecting means
Even if the light emitted from the light-emitting portion enters the internal electrode, the period during which the electric charge is retained in the internal electrode is very short, so that there is little danger of unnecessary electric charge being accumulated.
【００１０】[0010]
【実施例】以下、本発明の一実施例について添付図面を
参照して説明する。図１は、本実施例に係る表面パター
ン読取装置の構成を示す斜視図である。この表面パター
ン読取装置は、硬貨の表面に刻印された図形、模様、数
字、又は文字等からなるパターンを読み取る装置であ
る。同図より本実施例の表面パターン読取装置は、直方
体形状の撮像ユニット１０と、撮像ユニット１０上面の
対向する周縁部にそれぞれ取り付けられた平面板２０，
２１と、撮像ユニット１０及び平面板２０，２１の上方
に配設されたベルトコンベヤ３０とを備えている。撮像
ユニット１０の上面と平面板２０，２１の上面の高さは
一致しており、全体で一平面が形成され、硬貨の搬送路
となっている。この平面とベルトコンベヤ３０の下面と
は硬貨の厚さとほぼ同一の隙間が空けられており、ベル
トコンベヤ３０の駆動によって、この隙間を硬貨が搬送
される。An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view illustrating the configuration of the surface pattern reading device according to the present embodiment. This surface pattern reading device is a device that reads a pattern formed of a figure, a pattern, a number, a character, or the like imprinted on the surface of a coin. As shown in the figure, the surface pattern reading apparatus of the present embodiment includes a rectangular parallelepiped imaging unit 10 and flat plates 20 attached to opposing peripheral portions of the upper surface of the imaging unit 10.
And a belt conveyor 30 disposed above the imaging unit 10 and the flat plates 20 and 21. The heights of the upper surface of the imaging unit 10 and the upper surfaces of the plane plates 20 and 21 coincide with each other, and a single plane is formed as a whole, forming a coin transport path. A gap substantially equal to the thickness of the coin is provided between the flat surface and the lower surface of the belt conveyor 30, and the coin is transported through the gap by driving the belt conveyor 30.
【００１１】図２に示すように、撮像ユニット１０は、
上面が開口した立方体形状の筐体１１とこの上面開口を
覆うガラスからなる上面板１２とから構成され、筐体１
１内部にＣＣＤ１３、ＬＥＤ（発光部）１４、及びＬＥ
Ｄ（発光手段）１５が配設されている。ＣＣＤ１３は筐
体１１内部中央の固定台１６に取り付けられ、上面板１
２上を通過する硬貨の表面パターンを撮像する。また、
ＬＥＤ１４は筐体１１内部側面から突出した固定板１７
に取り付けられ、上面板１２に向けて光を照射する。さ
らに、ＬＥＤ１５は上面板１２の裏面に沿ってリング形
に配設され、上面板１２上を通過する硬貨に光を短時間
照射する。As shown in FIG. 2, the imaging unit 10
A cubic case 11 having an open upper surface and an upper plate 12 made of glass covering the upper surface opening are provided.
1, CCD 13, LED (light emitting unit) 14, and LE inside
D (light emitting means) 15 is provided. The CCD 13 is attached to a fixed base 16 in the center of the housing 11 and
An image of a surface pattern of a coin passing over 2 is taken. Also,
The LED 14 has a fixed plate 17 protruding from the inner side surface of the housing 11.
And irradiates light toward the upper surface plate 12. Further, the LEDs 15 are arranged in a ring shape along the back surface of the upper plate 12 and irradiate coins passing over the upper plate 12 with light for a short time.
【００１２】図１に示すベルトコンベヤ３０のベルト
は、前記搬送路の中央に設けられていて、該ベルトの両
側に配置された複数（２個）のＬＥＤ１４から照射され
た光は上面板１２及びベルトコンベヤ３０のベルトの両
側を通過して上方に向けて進行する。ベルトコンベヤ３
０上方の照射光の光路上には２個のＰＤ（受光部）４０
が配設されており、ベルトコンベヤ３０のベルトの両側
を通過した光はそれぞれ対向するＰＤ４０に入射する。The belt of the belt conveyor 30 shown in FIG. 1 is provided at the center of the conveying path, and light emitted from a plurality (two) of LEDs 14 arranged on both sides of the belt is applied to the upper plate 12 and the upper plate 12. It passes through both sides of the belt of the belt conveyor 30 and travels upward. Belt conveyor 3
0 There are two PDs (light receiving units) 40 on the optical path of the irradiation light above.
Are disposed, and light passing through both sides of the belt of the belt conveyor 30 enters the PDs 40 facing each other.
【００１３】次に、本実施例による硬貨の表面パターン
読取り処理について、図３の概念図を用いて説明する。
図３（ａ）は、上面板１２と平面板２０，２１からなる
搬送路とベルトコンベヤ３０の隙間に硬貨が挿入された
状態を示している。ＬＥＤ１４からは光が上方に向けて
照射されており、照射光は上面板１２及びベルトコンベ
ヤ３０のベルトの両側を通過してＰＤ４０に入射してい
る。Next, a coin surface pattern reading process according to this embodiment will be described with reference to the conceptual diagram of FIG.
FIG. 3A shows a state in which coins are inserted in a gap between the belt conveyor 30 and a transport path including the upper surface plate 12 and the flat plates 20 and 21. Light is emitted upward from the LED 14, and the emitted light passes through the upper surface plate 12 and both sides of the belt of the belt conveyor 30 and enters the PD 40.
【００１４】次に、図３（ｂ）に示すように、ベルトコ
ンベヤ３０のベルトの移動に合わせて硬貨が搬送され、
ＬＥＤ１４からの照射光の光路上に到達すると、照射光
は硬貨によって遮られ、ＰＤ４０での受光量は所定レベ
ル未満となる。ＰＤ４０での受光量の減少によって、本
装置は硬貨が上面板１２上のＣＣＤ１３の撮像領域に接
近していると判断する。Next, as shown in FIG. 3B, coins are conveyed in accordance with the movement of the belt of the belt conveyor 30, and
When the irradiation light from the LED 14 reaches the optical path, the irradiation light is blocked by coins, and the amount of light received by the PD 40 becomes less than a predetermined level. The apparatus determines that the coin is approaching the imaging area of the CCD 13 on the upper surface plate 12 due to the decrease in the amount of light received by the PD 40.
【００１５】さらに硬貨が搬送されて、図３（ｃ）に示
すように、撮像ユニット１０の上面板１２中央に硬貨が
到達すると、それまで硬貨により阻まれていたＬＥＤ１
４からの照射光は再びＰＤ４０に照射され、ＬＥＤ１５
を点灯させるための信号が出力される。この信号により
ＬＥＤ１５から光が照射され、硬貨の表面パターンを浮
かび上がらせる。照射光は硬貨の表面に斜めから入射す
るので、硬貨の表面の凹凸によって陰影のあるパターン
像が浮かび上がる。この表面パターンを下方に配置され
たＣＣＤ１３で撮像することにより、鮮明な硬貨の表面
パターンの画像が得られる。ＬＥＤ１５からの光の照射
は極めて短時間なので、移動中の硬貨の一瞬を捕らえた
静止画像を撮像することができる。When the coin is further conveyed and reaches the center of the upper surface plate 12 of the image pickup unit 10 as shown in FIG.
4 is again irradiated on the PD 40 and the LED 15
Is output. Light is emitted from the LED 15 by this signal, and the surface pattern of the coin emerges. Since the irradiation light is obliquely incident on the surface of the coin, a pattern image having a shadow appears due to the unevenness of the surface of the coin. By imaging this surface pattern with the CCD 13 arranged below, a clear image of the coin surface pattern can be obtained. Since the irradiation of light from the LED 15 is extremely short, a still image capturing an instant of the moving coin can be captured.
【００１６】このＣＣＤ１３の撮像処理について、図４
のブロック図、図５の波形図を用いて説明する。ＣＣＤ
１３には、制御回路５０からの制御信号（取込み信号
（図５（ｂ）参照）、読出し信号（図５（ｆ）参照））
がドライバ５１を介して与えられ、この制御信号に従っ
た処理を行う。ＣＣＤ１３から出力された硬貨の表面パ
ターンの画像データ（図５（ｇ）参照）は、アンプ５２
で増幅されて出力される。ＣＣＤ１３は、内部電極に電
荷を蓄積させる電荷蓄積処理と前記内部電極に蓄積され
た電荷を出力する電荷出力処理を排他的に実行する機能
を有しており、電荷蓄積処理は取込み信号（図５（ｂ）
参照）にパルスが与えられた場合に行われ、電荷出力処
理は読出し信号（図５（ｆ）参照）にパルスが与えられ
た場合に行われる。FIG. 4 shows the image pickup process of the CCD 13.
This will be described with reference to the block diagram of FIG. CCD
Reference numeral 13 denotes a control signal from the control circuit 50 (a fetch signal (see FIG. 5B) and a read signal (see FIG. 5F)).
Is provided through the driver 51, and performs processing according to the control signal. The image data of the surface pattern of the coin output from the CCD 13 (see FIG.
Is amplified and output. The CCD 13 has a function of exclusively executing a charge accumulation process for accumulating electric charges in the internal electrodes and a charge output process for outputting the electric charges accumulated in the internal electrodes. (B)
Is performed when a pulse is applied to the readout signal (see FIG. 5 (f)). The charge output process is performed when a pulse is applied to the readout signal (see FIG. 5 (f)).
【００１７】ＣＣＤ１３の各処理は次のように行われ
る。まず、ＬＥＤ１４からの照射光が硬貨によって遮ら
れ、ＰＤ４０の受光量が減少すると、この受光量信号
（図５（ａ）参照）は制御手段５０に与えられ、制御手
段５０は硬貨がＣＣＤ１３の撮像領域に接近していると
判断する。撮像領域に硬貨が到達すると、それまで硬貨
により阻まれていたＬＥＤ１４からの照射光は再びＰＤ
４０に照射され、制御回路５０からＬＥＤ１５とＣＣＤ
１３に制御信号（図５（ｂ）（ｄ）参照）が送られる。
この制御信号によって、ＬＥＤ１５から光が照射される
と共に、それまで継続していた蓄積電荷の水平１ライン
１Ｈ（６３．５μｓ）毎の排出動作が中断され（図５
（ｃ）参照）、ＣＣＤ１３の電荷蓄積処理が実行され
る。このため、ＬＥＤ１５からの照射光が硬貨の表面で
反射して、反射光による表面パターンの光像がＣＣＤ１
３の内部電極に電荷として蓄えられる（図５（ｅ）参
照）。制御回路５０では、電荷蓄積処理が終了した段
階、つまりＬＥＤ１５の照射終了に合わせて、ＣＣＤ１
３の電荷出力処理を実行させるための制御信号（読出し
信号（図５（ｆ）参照））をＣＣＤ１３に与え、ＣＣＤ
１３からは表面パターンの画像データ（図５（ｇ）参
照）が出力される。このように、ＣＣＤ１３の内部電極
に電荷が蓄積されている期間（ｔ 2 ）が非常に短いの
で、ＬＥＤ１４からの照射光が硬貨表面、或いは上面板
１２の内面で反射して、ＣＣＤ１３の内部電極に入射す
ることがあっても、この入射光が電荷として蓄積される
ことはほとんどない。以上より、本実施例の表面パター
ン読取装置は、外部から侵入した光の影響を受け難い優
れた性能を有した装置であることが判る。Each process of the CCD 13 is performed as follows. First, intercepted by the irradiation light coins from LED 14, the light receiving amount of PD40 is reduced, the amount of received light signal (see FIG. 5 (a)) is applied to the control means 50, control means 50 imaging coin of CCD13 Judge that you are approaching the area. When the coin reaches the imaging area, the irradiation light from the LED 14, which has been blocked by the coin, returns to the PD again.
The control circuit 50 irradiates the LED 15 and the CCD.
A control signal (see FIGS. 5B and 5D) is sent to 13.
In response to the control signal, light is emitted from the LED 15 and one horizontal line of the accumulated charge that has been continued until then.
The discharging operation is interrupted every 1H (63.5 μs) (FIG. 5).
(C), the charge accumulation process of the CCD 13 is executed. For this reason, the irradiation light from the LED 15 is reflected on the surface of the coin, and the light image of the surface pattern by the reflected light is reflected on the CCD 1.
3 is stored as an electric charge in the internal electrode 3 (see FIG. 5E). In the control circuit 50, at the stage when the charge accumulation process is completed, that is, when the irradiation of the LED 15 is completed, the CCD 1
3 control signal for executing the charge output process (read <br/> signal (see FIG. 5 (f))) to give the CCD 13, CCD
13 outputs image data of the surface pattern (see FIG. 5 (g)). As described above, since the period (t 2 ) during which electric charges are accumulated in the internal electrodes of the CCD 13 is very short, the irradiation light from the LED 14 is reflected on the coin surface or the inner surface of the upper plate 12, and However, this incident light hardly accumulates as electric charges. From the above, it can be seen that the surface pattern reading apparatus of the present embodiment is an apparatus having excellent performance which is hardly affected by light entering from the outside.
【００１８】なお、本発明は上記実施例に限定されるこ
となく、種々の変形が可能である。例えば、ベルトコン
ベヤ３０のベルトは必ずしも光を透過する材質のものに
限定されず、樹脂或いはその他の材質を用いてもよい。
ただし、非透過性の材質を用いた場合には、少なくとも
ＬＥＤ１４の光路上に貫通溝などを形成し、ＬＥＤ１４
からの照射光がＰＤ４０で受光できるようにする必要が
ある。また、本発明の読取対象物は硬貨に限定されるこ
となく、メダル、カードなどでもよい。It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified. For example, the belt of the belt conveyor 30 is not necessarily limited to a material that transmits light, and may be a resin or another material.
However, when a non-transmissive material is used, a through groove or the like is formed at least on the optical path of the LED 14 so that the LED 14
It is necessary to be able to receive the irradiation light from the PD 40. The object to be read of the present invention is not limited to coins, but may be medals, cards, and the like.
【００１９】[0019]
【発明の効果】以上詳細に説明したように、本発明の表
面パターン読取装置であれば、撮像手段の内部電極への
電荷の蓄積処理が終了すると同時に、電荷の出力が行わ
れるので、内部電極で電荷を保持する期間は非常に短
い。このため、外部から侵入した光の影響で不要な電荷
が蓄積されることはほとんどない。つまり、例えば、撮
像領域への読取対象物の接近を検出する検出手段が設け
られていた場合、この検出手段が備える発光部からの照
射光が内部電極に入射しても、内部電極に電荷を保持し
ている期間が非常に短いため、不要な電荷が蓄積される
危険性が少ない。As described above in detail, according to the surface pattern reading apparatus of the present invention, the charge is output to the internal electrodes of the image pickup means at the same time as the completion of the charge accumulation processing. Is very short. For this reason, unnecessary electric charges hardly accumulate under the influence of light that has entered from the outside. That is, for example, when a detection unit that detects the approach of the object to be read to the imaging area is provided, even if the irradiation light from the light emitting unit included in the detection unit is incident on the internal electrode, a charge is applied to the internal electrode. Since the holding period is very short, there is little danger that unnecessary charges are accumulated.
【図１】本実施例に係る表面パターン読取装置の構成を
示す斜視図である。FIG. 1 is a perspective view illustrating a configuration of a front surface pattern reading device according to an embodiment.
【図２】撮像ユニットの断面構造を示す斜視図である。FIG. 2 is a perspective view illustrating a cross-sectional structure of an imaging unit.
【図３】本実施例による硬貨の表面パターン読取り処理
を示す概念図である。FIG. 3 is a conceptual diagram showing a coin surface pattern reading process according to the embodiment.
【図４】本実施例の内部構成を示すブロック図である。FIG. 4 is a block diagram illustrating an internal configuration of the embodiment.
【図５】本実施例による硬貨の表面パターン読取り処理
を示す波形図である。FIG. 5 is a waveform diagram showing a coin surface pattern reading process according to the embodiment.
１０…撮像ユニット、１１…筐体、１２…上面板、１３
…ＣＣＤ、１４…ＬＥＤ（発光部）、１５…ＬＥＤ（発
光手段）、１６…固定台、１７…固定板、２０，２１…
平面板、３０…ベルトコンベヤ、４０…ＰＤ（受光
部）、５０…制御回路、５１…ドライバ、５２…アン
プ。10 imaging unit, 11 housing, 12 top plate, 13
... CCD, 14 ... LED (light emitting part), 15 ... LED (light emitting)
Light means) , 16: fixed base, 17: fixed plate, 20, 21, ...
Flat plate, 30 ... Belt conveyor, 40 ... PD (Light receiving
) , 50: control circuit, 51: driver, 52: amplifier.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G06T 1/00 G07D 5/02 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) G06T 1/00 G07D 5/02
Claims (1)
象物の表面パターンを読み取る表面パターン読取装置に
おいて、前記基準面の所定の撮像領域を貫いて光を照射する発光
部と、前記撮像領域を挟んで前記発光部に対向して配置
され、前記発光部からの照射光を受光する受光部とを有
してなる検出手段と、 前記受光部での受光量の変化を検出し、その受光量が減
少した状態から増加した際に、前記撮像領域に前記読取
対象物が到達したことを示す制御信号を送出する制御回
路と、 前記制御回路から送出された前記制御信号に従って 前記
読取対象物の表面に光を照射する発光手段と、 光の入射を受けて内部電極に電荷を蓄積させる第１の処
理と前記内部電極に蓄積された電荷を出力する第２の処
理を実行する機能を有し、前記発光手段からの光の照射
タイミングと同期して、それまで継続していた蓄積電荷
の水平１ライン毎のオーバーフロードレインへの排出動
作を中断させると共に前記第１の処理を行い、前記発光
手段からの照射光が前記読取対象物の表面で反射した光
の入射を受けて内部電極に電荷を蓄積させ、さらに、前
記第１の処理の終了タイミングと同期して前記第２の処
理を行い、前記内部電極に蓄積された電荷を出力する撮
像手段とを備えることを特徴とする表面パターン読取装
置。1. A surface pattern reading device for reading a surface pattern of an object to be read conveyed along a predetermined reference plane , wherein light is emitted through a predetermined imaging area of the reference plane.
And the light emitting unit are disposed opposite to each other with the imaging area interposed therebetween.
And a light receiving unit for receiving the irradiation light from the light emitting unit.
Detecting means for detecting a change in the amount of light received by the light receiving section and reducing the amount of received light.
When increasing from a slight state, the reading is performed in the imaging area.
A control circuit that sends a control signal indicating that the object has arrived
Path , light emitting means for irradiating light to the surface of the object to be read in accordance with the control signal sent from the control circuit, first processing for receiving light and accumulating electric charge in an internal electrode, and the internal electrode A function of executing a second process of outputting the electric charge accumulated in the storage unit, and synchronizing with the irradiation timing of the light from the light emitting unit, the accumulated electric charge which has been continued until then.
To the overflow drain for each horizontal line
Performing the first processing while interrupting the operation, receiving the light reflected by the surface of the object to be read by the irradiation light from the light emitting means and accumulating the electric charge in the internal electrode; A surface pattern reading device, comprising: an image pickup unit that performs the second process in synchronization with the end timing of the process and outputs electric charges accumulated in the internal electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22016894A JP3359158B2 (en) | 1994-09-14 | 1994-09-14 | Surface pattern reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22016894A JP3359158B2 (en) | 1994-09-14 | 1994-09-14 | Surface pattern reader |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0883335A JPH0883335A (en) | 1996-03-26 |
| JP3359158B2 true JP3359158B2 (en) | 2002-12-24 |
Family
ID=16746956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22016894A Expired - Fee Related JP3359158B2 (en) | 1994-09-14 | 1994-09-14 | Surface pattern reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3359158B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19922489A1 (en) * | 1999-05-15 | 2000-11-23 | Nat Rejectors Gmbh | Method for recognizing the spatial configuration of coins |
-
1994
- 1994-09-14 JP JP22016894A patent/JP3359158B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0883335A (en) | 1996-03-26 |
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